What break-even actually measures
Break-even analysis identifies the sales level at which a business's total revenue equals its total costs — fixed costs plus variable costs — so profit is exactly zero. The U.S. Small Business Administration describes it as a core planning tool for estimating how much a business must sell before an idea becomes financially viable.
Fixed costs don't move with sales volume over the period you're analyzing — rent, salaried payroll, insurance. Variable costs rise and fall directly with each unit sold — materials, per-unit shipping, sales commissions paid per sale. The gap between price and variable cost per unit is the contribution margin: the amount each sale contributes toward covering fixed costs before any profit is earned. Once fixed costs are fully covered by accumulated contribution margin, every additional unit sold contributes directly to profit.
The formula and a worked example
Contribution margin per unit is selling price minus variable cost per unit. Break-even in units is fixed costs divided by that contribution margin per unit. Break-even revenue simply multiplies the break-even unit count by the price per unit.
Take a business with $50,000 in fixed costs, a $40 price per unit, and a $25 variable cost per unit. Contribution margin per unit is $40 − $25 = $15. Break-even units are $50,000 ÷ $15 = 3,333.3, rounded up to 3,334 units. Break-even revenue is 3,334 × $40 = $133,360. The contribution margin ratio — contribution margin divided by price — is $15 ÷ $40 = 37.5%, meaning 37.5 cents of every revenue dollar goes toward covering fixed costs and, beyond that, profit.
- Contribution margin per unit = price − variable cost per unit ($40 − $25 = $15)
- Break-even units = fixed costs ÷ contribution margin per unit ($50,000 ÷ $15 = 3,333.3 → 3,334)
- Break-even revenue = break-even units × price per unit (3,334 × $40 = $133,360)
- Contribution margin ratio = (contribution margin ÷ price) × 100 ($15 ÷ $40 = 37.5%)
Why the unit count always rounds up
3,333 units at $15 of contribution margin each generates $49,995 — five dollars short of the $50,000 in fixed costs. Selling the 3,334th unit is what actually clears fixed costs and tips the business into profit, so break-even unit counts round up to the next whole unit rather than down or to the nearest unit. Treating 3,333 as 'close enough' understates what's actually required to break even, even if only by a handful of dollars.
Where the simple break-even model breaks down
This model assumes a single product (or a constant sales mix across products) and that price and variable cost per unit stay constant regardless of volume. Real-world costs can show step changes — a large enough volume increase can require additional fixed costs, like a new facility or an added shift, which shifts the break-even point itself. Fixed costs are only fixed within the relevant range of output being analyzed.
Using an average price or cost across multiple products with different margins is a common way this model goes wrong: it can materially misstate the true break-even point for any single product, and the break-even point is worth revisiting whenever price, cost, or fixed-expense structure changes rather than treating it as a one-time calculation.
Pertanyaan yang sering diajukan
How do you calculate break-even point in units?
Divide fixed costs by the contribution margin per unit (price minus variable cost per unit), then round up to the next whole unit. With $50,000 in fixed costs, a $40 price, and a $25 variable cost, contribution margin is $15 per unit, so break-even is $50,000 ÷ $15 = 3,333.3, rounded up to 3,334 units.
What is the difference between break-even units and break-even revenue?
Break-even units is the number of units that must be sold to cover fixed costs; break-even revenue converts that into dollars by multiplying the unit count by the price per unit. In the example above, 3,334 units at $40 each is $133,360 in break-even revenue.
What is the contribution margin ratio used for?
The contribution margin ratio expresses contribution margin as a percentage of price, which makes it easier to compare products with different price points. A 37.5% ratio means 37.5 cents of every revenue dollar is available to cover fixed costs and, once those are covered, contribute to profit.
Does reaching break-even mean a business is profitable?
Reaching break-even means revenue exactly equals total costs — profit is zero, not positive. Profit only begins once sales volume exceeds the break-even point, since every unit sold beyond it contributes its full contribution margin directly to profit.
Referensi
- U.S. Small Business Administration. Write your business plan — break-even analysis guidance. sba.gov.
- Horngren CT, Datar SM, Rajan MV. Cost Accounting: A Managerial Emphasis. 16th ed. Pearson, 2018.
- Brealey RA, Myers SC, Allen F. Principles of Corporate Finance. 13th ed. McGraw-Hill Education, 2020.